Outrage is iover the top, but the thing is that it's a pretty obvious error in design - cheap/flexible plastic and only 2 screws make this happen. The problem is that it takes very little force to happen and it's basically non-fixable without a redesign of the block (which won't happen at least with this GPU serie, likely will for the 3000 blocks).
This said. Normal usage won't have the issue, and there are no leak reports due to it "wearing down". As Jayz said, it's easy to reproduce and identify the cause, but it's something people won't do AT ALL, because it means either wrong mounting/pressure on tubes or not doing proper leak testing beforehand. Also, while Corsair is a reputable brand, is new to the custom loop market and this looks an "inexperience" error. Most people buy stuff from other brands which are on the market by a long time and objectively have better quality products.
That's it. Even in the original MH video he said that he discovered the leak by chance and found that his mounting was applying the lateral pressure needed for the leak to happen. Corsair replaced the block, but honestly what can they do? It's the desing that's flawed and it's not fixable. Again, i'm sure next block serie won't have the issue since distancing the ports and adding a third screw is a super easy solution to design, but you cannot apply that to the existing line.
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Add to it that good air coolers have similar perfomance to most AIOs aswell, and require "less maintenance" (really, i've yet to see an AIO that requires any maintenance).
Non ti fidar di me se il cuor ti manca.
My Corsair H60 has been happily chugging along since 2016.
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Less thought, I think. You have to think about where to put the rad, and how to get the tubes there without it looking ugly.
AiO's don't require maintenance at all, unless you buy something like the EK phoenix series which is basically just a custom loop that comes with quick connect fittings instead of normal ones